forked from knative/pkg
/
fakeclient.go
109 lines (88 loc) · 2.93 KB
/
fakeclient.go
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/*
Copyright 2019 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package generators
import (
"io"
"k8s.io/gengo/generator"
"k8s.io/gengo/namer"
"k8s.io/gengo/types"
"k8s.io/klog"
)
// fakeClientGenerator produces a file of listers for a given GroupVersion and
// type.
type fakeClientGenerator struct {
generator.DefaultGen
outputPackage string
imports namer.ImportTracker
filtered bool
fakeClientPkg string
clientInjectionPkg string
}
var _ generator.Generator = (*fakeClientGenerator)(nil)
func (g *fakeClientGenerator) Filter(c *generator.Context, t *types.Type) bool {
// We generate a single client, so return true once.
if !g.filtered {
g.filtered = true
return true
}
return false
}
func (g *fakeClientGenerator) Namers(c *generator.Context) namer.NameSystems {
return namer.NameSystems{
"raw": namer.NewRawNamer(g.outputPackage, g.imports),
}
}
func (g *fakeClientGenerator) Imports(c *generator.Context) (imports []string) {
imports = append(imports, g.imports.ImportLines()...)
return
}
func (g *fakeClientGenerator) GenerateType(c *generator.Context, t *types.Type, w io.Writer) error {
sw := generator.NewSnippetWriter(w, c, "{{", "}}")
klog.V(5).Infof("processing type %v", t)
m := map[string]interface{}{
"clientKey": c.Universe.Type(types.Name{Package: g.clientInjectionPkg, Name: "Key"}),
"fakeClient": c.Universe.Type(types.Name{Package: g.fakeClientPkg, Name: "Clientset"}),
"injectionRegisterClient": c.Universe.Function(types.Name{
Package: "knative.dev/pkg/injection",
Name: "Fake.RegisterClient",
}),
"loggingFromContext": c.Universe.Function(types.Name{
Package: "knative.dev/pkg/logging",
Name: "FromContext",
}),
}
sw.Do(injectionFakeClient, m)
return sw.Error()
}
var injectionFakeClient = `
func init() {
{{.injectionRegisterClient|raw}}(withClient)
}
func withClient(ctx context.Context, cfg *rest.Config) context.Context {
ctx, _ = With(ctx)
return ctx
}
func With(ctx context.Context, objects ...runtime.Object) (context.Context, *{{.fakeClient|raw}}) {
cs := fake.NewSimpleClientset(objects...)
return context.WithValue(ctx, {{.clientKey|raw}}{}, cs), cs
}
// Get extracts the Kubernetes client from the context.
func Get(ctx context.Context) *{{.fakeClient|raw}} {
untyped := ctx.Value({{.clientKey|raw}}{})
if untyped == nil {
{{.loggingFromContext|raw}}(ctx).Panic(
"Unable to fetch {{.fakeClient}} from context.")
}
return untyped.(*fake.Clientset)
}
`